The fannish catchphrase, "Dave Kyle says you can't sit here!" originated with the Balcony Insugents, a group of hecklers at NyCon II. Unwilling to pay $7 for rubber chicken at the banquet (a decade before $1.39 could purchase a T-bone steak meal at a chain of NYC restaurants) they nonetheless wanted to hear Al Capp’s GoH speech and see the ceremonies which followed.

It had been traditional at Worldcons that, after the meal, those who hadn't bought tickets could come in to hear the speakers. But convention chairman Dave Kyle had the doors closed when they gathered in the hall outside the banquet room, saying that since they hadn’t paid for the meal, they shouldn’t get to hear the speech. They moved to the balcony and began to jeer the business meeting after a gofer was sent to move them along, proclaiming, "Dave had says you can't sit here!"

Most of them subsequently wrote up the incident, dubbed the Balcony Exclusion Act, in the con reports they published in their fanzines which gave rise to the catchphrase that continued to be used for many years.

Fans assumed that Kyle was motivated by pique, since he’d over-guaranteed the banquet, which put the convention in the red. Kyle remained silent on the matter for close to 40 years, but eventually in the pages of the Hugo-winning fanzine Mimosa, he claimed he'd been told by a fire warden that the balcony was off limits and his helper should have made it clear that Kyle was only passing on that message. Several of the Balcony Insurgents pointed out that, even if true, for some reason this was only enforced immediately after the banquet when these other festivities were going on.